Which scenario exemplifies functional turnover?

Multiple choice question.

Gunnar imagined he was not far from being fired; this was his fifth tardy day this month.

Abby knew she could never advance in this organization; she began looking at competitor job postings.

Conny caught an employee stealing from the cash drawer; they immediately were let go$.$

Hugh knew he had a poor chance of keeping this job much longer; he was consistently the one with the lowest sales rate.